If you wanted to fake it, could you plate one leg with zinc? It would look silver on a video and maybe pass for an "untreated" LED. The anodic index of silver solder is the same as copper according to the table here:http://www.engineersedge.com/galvanic_capatability.htm

Let say you had a single cell made with a magnesium/copper plated tiny surface reaction area legs LED that might give 1.6 volts (the penny/nail open voltage is about 0.9) open circuit and drop to half that voltage value with a few micro-amp load because of high internal resistance. Would that work to light an LED?